Eigen/nilai‑vektor (2×2, 3×3)

• Kalkulator Matriks — RREF / Selesaikan Ax=b / Invers / Determinan (langkah)
  calculators, matrix, calculator, id
• Kalkulator Vektor — dot/cross, proyeksi, sudut, luas, triple (dengan langkah) | CalcBE
  calculators, vectors, calculator, id
• Alat Geometri & Grafik: Segitiga, Vektor, 2D/3D | CalcBE
  topics, geometry, id
• Aritmetika modular — gcd ekstensif / invers / pangkat cepat / CRT | CalcBE
  calculators, modular-arithmetic, calculator, math, modular, arithmetic, suite, extended, gcd, inverse, crt, id
• Barisan & Deret (Aritmetika / Geometri) — suku & jumlah dengan langkah | CalcBE
  calculators, sequences-series, calculator, id

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